Flask with cap



FIG. 1 is a perspective view showing our new design for a flask with cap;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines are included for purposes of illustrating portions of the flask with cap that form no part of the claimed design. 

CLAIM The ornamental design for a flask with cap, as shown and described. 